She doesn't have a swing, bouncer chair, high chair, or portable car seat that she can sit in? You don't have anyone who can hold her? Even a Boppy pillow or or a bunch of pillows around her will support her enough to sit up.
I've just tried to use two pillows, put my Sophiya between them and.....excellent. It really works!!! Bubub-bubub - the answer from daughter was.
We already know 3 additions!!!!
Fantastic!!! Thanks girls!